Display optimization techniques for micro-LED devices and arrays

Abstract

Systems and methods to achieve desired color accuracy, power consumption, and gamma correction in an array of pixels of a micro-LED display. The method and system provides an array of pixels, wherein each pixel comprising a plurality of sub-pixels arranged in a matrix and a driving circuitry configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control an emission time and a duty cycle of each sub-pixel.

I claim: 
     
       1. A display device comprising:
 an array of pixels, wherein each pixel includes a plurality of sub-pixels arranged in a matrix; and 
 a driving circuitry configured to provide an individual emission control signal to each sub-pixel of each pixel in the array of pixels to independently control an emission time and a duty cycle of each sub-pixel, the emission time of said each sub-pixel is T f *B full /B mj , wherein T f  is a frame time of a frame, B full  is a brightness of the display device when said each sub-pixel is on an optimized current density during the frame time, and B mj  is a major brightness during frame time; 
 wherein each row of the array of pixels is accessed twice during the frame time, the frame includes a first subframe and a second subframe following the first subframe, the first subframe is divided into a first emission time period and no emission time period following the first emission time period, and the second subframe is divided into a second emission time period and no emission time period following the second emission time period; 
 wherein the first emission time period is indicative of a first grayscale, the second emission time period is indicative of a second grayscale, the second grayscale is higher than the first grayscale. 
 
     
     
       2. The display device, wherein a first emission control signal is provided concurrently to each sub-pixel of a first color in at least one row of pixels, a second emission control signal is provided concurrently to each sub-pixel of a second color in at least the one row of pixels, and a third emission control signal is provided concurrently to each sub-pixel of a third color in at least the row of pixels. 
     
     
       3. The display device as claimed in  claim 2 , wherein the first color is red, the second color is green, and the third color is blue. 
     
     
       4. The display device as claimed in  claim 2 , wherein a fourth emission control signal is provided to each sub-pixel of a fourth color in the array of pixels, wherein the fourth color is one of cyan, white, and yellow. 
     
     
       5. The display device as claimed in  claim 1 , wherein the emission control signal is a pulse-width-modulation (PWM) signal. 
     
     
       6. The display device as claimed in  claim 1 , wherein each pixel and sub-pixel is a micro-light emitting device (LED). 
     
     
       7. The display device as claimed in  claim 2 , wherein the first, second and third emission control signals are enabled at a same time or a different time during a frame time. 
     
     
       8. The display device as claimed in  claim 6 , wherein the first, second and third emission control signals are turned on and off multiple times at different duty cycle during the frame time. 
     
     
       9. The display device as claimed in  claim 1 , wherein the emission time or the duty cycle for each sub-pixel is dynamically adjusted to tune the display device color and optimize power consumption. 
     
     
       10. The display device of  claim 1 , wherein a frame data is evaluated to find the optimized duty cycle and the emission time. 
     
     
       11. The display device of  claim 1 , wherein an optimization algorithm is employed to calculate a global or a local optimized value for the duty cycle or the emission time for each sub-pixel. 
     
     
       12. The display device as claimed in  claim 9 , wherein the duty cycle is optimized for two range of grayscales to achieve the lowest power consumption. 
     
     
       13. A method for controlling a pixel circuit of an array of pixel circuits of a display device, the pixel circuit comprising a plurality of subpixels, the method comprising:
 providing an individual emission control signal to each sub-pixel of each pixel in the array of pixel circuits independently to control an emission time and a duty cycle of the sub-pixels, the emission time of said each sub-pixel is T f *B full /B mj , wherein T f  is a frame time of a frame, B full  is a brightness of the display device when said each sub-pixel is on at an optimized current density during the frame time and B mj  is the major brightness during frame time, 
 accessing each row of the array of pixel circuits twice during the frame time, wherein the frame includes a first subframe and a second subframe following the first subframe, the first subframe is divided into a first emission time period and no emission time period following the first emission time period, and the second subframe is divided into a second emission time period and no emission time period following the second emission time period; 
 wherein the first emission time period is indicative of a first grayscale, the second emission time period is indicative of a second grayscale, the second grayscale is higher than the first grayscale. 
 
     
     
       14. The method as claimed in  claim 13 , wherein the emission time or the duty cycle for each sub-pixel is dynamically adjusted to tune the display device color and optimize power consumption. 
     
     
       15. The method as claimed in  claim 13 , wherein a frame data is evaluated to find the optimized duty cycle and the emission time. 
     
     
       16. The method as claimed in  claim 13 , wherein an optimization algorithm is employed to calculate a global or a local optimized value for the duty cycle or the emission time for each sub-pixel. 
     
     
       17. The method as claimed in  claim 13 , wherein the duty cycle is optimized for two range of grayscales to achieve the lowest power consumption. 
     
     
       18. The method as claimed in  claim 13 , wherein the emission control signal is a pulse-width-modulation (PWM) signal. 
     
     
       19. The method as claimed in  claim 13 , wherein each pixel and sub-pixel is a micro-light emitting device (LED). 
     
     
       20. The method as claimed in  claim 13 , further comprising:
 providing a first emission control signal concurrently to each sub-pixel of a first color in at least one row of pixels; 
 providing a second emission control signal concurrently to each sub-pixel of a second color in at least the one row of pixels; and 
 providing a third emission control signal concurrently to each sub-pixel of a third color in at least the row of pixels.